uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/libraries/SDL/setup-hook.sh

@@ -0,0 +1,10 @@
+addSDLPath () {
+  if [ -e "$1/include/SDL" ]; then
+    export SDL_PATH="${SDL_PATH-}${SDL_PATH:+ }$1/include/SDL"
+  fi
+  if [ -e "$1/lib" ]; then
+    export SDL_LIB_PATH="${SDL_LIB_PATH-}${SDL_LIB_PATH:+ }-L$1/lib"
+  fi
+}
+
+addEnvHooks "$hostOffset" addSDLPath